Abstract
Single crystal polarized Raman spectra of p-diiodobenzene in the region from 0 to 300 cm-1 are presented for sample temperatures from 2 to 330 K. Eleven of the twelve predicted gerade librational phonons are unambiguously assigned in terms of their space group symmetries. The temperature dependence of the Raman spectra does not show a soft gerade phonon at the nearly second-order phase transition which occurs at 326 K. A significant anharmonicity for molecular motions above the I-I axis is indicated by the observation of overtones and combinations and broadening of these phonons as the temperature is raised from 2 K.
Original language | English (US) |
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Pages (from-to) | 1140-1145 |
Number of pages | 6 |
Journal | The Journal of Chemical Physics |
Volume | 64 |
Issue number | 3 |
DOIs | |
State | Published - 1976 |
Externally published | Yes |
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry